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THE VR BLOG

    Did you know...

    Did you know...

    ...that you can receive emails when a test is completed?

    Is your lab facility backlogged and swamped with vibration tests that need to be conducted?
    Are you concerned about when a test completes (or aborts) so that you can get another test running ASAP?

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    Topics: vibration testing

    When Should I add Kurtosion to my Random Vibration Test?

         Random vibration testing has been around for quite some time. But traditional random vibration testing is Gaussian in nature. The averaging method used in random vibration testing produces a Gaussian distribution of data in which the highest peak accelerations are approximately +/- 3 times the average acceleration. Gaussian distribution has been universally accepted as a legitimate averaging technique, in part, because it has been assumed that “real-world” data is Gaussian.
    However, several studies have determined that “real-world” data in actually non-Gaussian. Since this is true, the question is how can one make a random vibration test more realistic?

    What is Gaussian Distribution?

         With the use of statistics, one can find a number of interesting things about a set of collected data. For example, one can easily compute the mean and the standard deviation of a data set – statistical concepts familiar to most people communicating the average of the data set and the range in which most of the data points fall. But a less familiar statistical concept is the kurtosis of the data set. Kurtosis is a measure of the “peakyness” of the probability distribution of the data. For example, a high kurtosis value indicates the data is distributed with some very large outlier data points, while a low kurtosis value indicates most data points fall near the mean with few and small outlier data points.
    If one evaluates a random data set, one will find that the data points will fall within +/- 3 standard deviations of the average (mean) (Figure 1). This is defined as a Gaussian distribution (kurtosis = 3).

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    Topics: random, kurtosion

    When Should I Use SINE Vibration Testing?

    Topics: sine, vibration testing

    Accelerometer Selection:  What should I use for my Vibration Test?

    Topics: accelerometer

    Transducer Selection:  Which one should I use for my Vibration Test?

    Topics: Transducers

    The Breaking Point: How Fatigue Damage Spectrum Can Help Predict a Product’s Life Expectancy

    Topics: FDS, Education

    Make Things Go Smoothly Even When They Shouldn't

    Topics: Education, Tips and Tricks

    Vibration Research’s Top Shaker Preventative Maintenance Tips

    Topics: shakers

    Why Vibration Tests Fail to Launch

    Topics: shaker, vibration testing, accelerometer, Test Setup, Checklists

    Salt Shaker on Vibration Table

    Topics: vr9500, shakers, Education